EEVblog 1755 - Tolicore Femtoammeter TEARDOWN + REVERSE ENGINEER

Demo, teardown and reverse engineering of the Tolicore 3720 Femtoammeter and voltage source.https://tolicore.com/products/3720-femtoammeter-voltage-source/https://tolicore.com/product-documents/3720-Datasheet.pdfKeithley low current measurement handbook: https://www.tek.com/en/documents/product-article/keithley-low-level-measurements-handbook---7th-editionCounting LED photons video: https://www.youtube.com/watch?v=TJcMgoJ4DOE00:00 - Femtoammeter measurement01:16 - Tolicore 3720 Femtoammeter unboxing03:39 - Power on and UI05:18 - 20pA full scale range10:13 - Bluetooth and 11:35 - Humidity measurement is important12:21 - Crazy sensitive!13:45 - LED as a current source demo15:28 - 1nA measurement test16:43 - Burden voltage and electrometer input + self calibration20:14 - Teardown22:20 - Voiding the warranty25:05 - Reverse engineering27:32 - How a PCB guard ring works33:52 - Humidity matters34:33 - The voltage output35:23 - Porcelain Multilayer Capacitors36:22 - Voltmeter input38:24 - Potentiostatic and Amperostatic Coulometry40:15 - ADA4530-1 Internal schematic42:25 - Contamination and PCB assembly cleaning matters44:03 - Rogers PCB materialForum: https://www.eevblog.com/forum/blog/eevblog-1755-tolicore-femtoammeter-teardown-reverse-engineer/Web Site: http://www.eevblog.comHardware Store: https://eevblog.store/Merch Store: https://eevblog.dashery.com/If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblogOther channels:EEVblog2: http://www.youtube.com/EEVblog2EEVdiscover: https://www.youtube.com/eevdiscover#ElectronicsCreators #Teardown...https://www.youtube.com/watch?v=Gdj-8amVTx0